added keyboard interupt handling

main.py

@@ -28,23 +28,27 @@ ntfy_token = os.environ['NTFY_Token']
 device_name = os.environ['device_name']
 shutdown_timer = int(os.environ['shutdown_timer'])
 
-with serial.Serial(device_name, 115200, timeout=1) as ser:
-    inverter_offline_counter = 0
-    while True:
-        if ser.readline().decode().strip() == "0":
-            logger.debug("Inverter Online")
-            inverter_offline_counter = 0
-        elif inverter_offline_counter >= shutdown_timer:
-            break
-        else:
-            inverter_offline_counter += 1
-            logger.info(f"Running on UPS reserve, offline for {inverter_offline_counter}s")
-    logger.info(f"Inverter offline for {shutdown_timer} seconds")
-    requests.post("https://ntfy.fieryeagle.org/Internet-Alerts",
-                  data="Inverter offline, shutting down".encode(encoding='utf-8'),
-                  headers={
-                      "Title": "Hydrogen running on reserve power",
-                      "Authorization": f"Bearer {ntfy_token}"
-                      }
-                  )
-    os.system("shutdown now")
+try:
+    with serial.Serial(device_name, 115200, timeout=1) as ser:
+        inverter_offline_counter = 0
+        while True:
+            if ser.readline().decode().strip() == "0":
+                logger.debug("Inverter Online")
+                inverter_offline_counter = 0
+            elif inverter_offline_counter >= shutdown_timer:
+                break
+            else:
+                inverter_offline_counter += 1
+                logger.info(f"Running on UPS reserve, offline for {inverter_offline_counter}s")
+        logger.info(f"Inverter offline for {shutdown_timer} seconds")
+        requests.post("https://ntfy.fieryeagle.org/Internet-Alerts",
+                    data="Inverter offline, shutting down".encode(encoding='utf-8'),
+                    headers={
+                        "Title": "Hydrogen running on reserve power",
+                        "Authorization": f"Bearer {ntfy_token}"
+                        }
+                    )
+        os.system("shutdown now")
+except KeyboardInterrupt:
+    logger.info("Exiting gracefully")
+    exit()